Empress said:
"How about the GTAA reduced rate parking lot? I saw this on the GTAA website and it has a coupon online for "First 5 hours free + 25% off any additional time." "
If I had been around to jump on this thread earlier, that is what I would have suggested. This lot is right across the road from the employee parking lot for terminals 1 and 2. You could hop on whichever bus arrived first and get back and forth right quick. Five minutes would be a long wait with this method.